OPERATING MANUAL SK1000 TWO DOOR CHILLER FRIDGE
Page 7
5. Compressor starts and runs,
butshort cycles on overload
protector (relay may chatter on
RSIR, CSIR and CSR motors).
Additional current passing through overload
protector.
Low voltage to unit.
Overload protector defective.
Run capacitor defective on CSR motor.
Excessive discharge pressure.
Suction pressure too high.
Compressor too hot - insucient suction gas
cooling.
Comp’r motor has a winding shorted.
Check wiring diagram. Check for added
fan motors etc., connected to wrong side of
protector.
Determine reason and correct.
Check current, replace protector.
Determine reason and replace.
Check condenser, check ventilation, check for
restrictions in refrigeration system.
Check for possibility of misapplication.
Check refrigerant charge (x leak), add if
necessary. Check return vapour temperature
and suction superheat.
Replace compressor.
6. Unit runs OK, but short cycles.
Overload protector.
Thermostat: requires adjustment or incorrectly
positioned.
Incorrect refrigerant charge.
See section 4 on p.21.
Adjust or relocate thermostat.
Adjust refrigerant charge.
7. Unit operates long or continu-
ously.Unsatisfactory cabinet
tem¬perature.
Short of refrigerant.
Overcharge of refrigerant.
Thermostat not cooling correctly.
Freezer has excessive load.
Evaporator coil iced.
Restriction in refrigeration system.
Dirty condenser.
Inadequate air circulation.
Compressor not pumping eciently.
Filter dirty (if applicable).
Faulty fan motor.
Fix leak, and add charge.
Remove refrigerant to correct charge.
Adjust thermostat (clockwise colder), and check
thermostat bulb location. If necessary, replace
thermostat.
Establish load within limits.
Defrost evaporator, check refrigeration. Check
thermostat. Check door closing, seals etc.
Determine location and clear restriction.
Flush with dry nitrogen. Replace component if
blockage will not clear.
Clean condenser. Advise client how to regularly
clean condenser.
Internal: Improve air movement, alloe airow
around stock.External: Remove any restrictions
to condensing ventilation.
Replace compressor.
Clean or replace.
Check rotation. Replace if necessary.
8. Start capacitor open, shorted
or blown.
Relay contact not opening properly.
Prolonged operation on start cycle due to:(a)
Low voltage to unit.(b) Improper relay.
Excessive short cycling.
Improper capacitor.
Clean contacts, or replace relay if necessary.
(a) Determine reason and correct.(b) Replace
relay.
Determine reason for short cycling (see section
5 on p.21), and correct.
Determine correct size and replace.
9. Relay defective or burned out.
Incorrect relay.
Line voltage too high or too low.
Excessive short cycling.
Relay being inuenced by loose vibrating mount.
Check and replace.
Determine reason and correct.
Determine reason (see section 5 on p.21), and
correct.
Remount rigidly.
10. Suction line frosted. Evaporator fan not running.
Overcharge of refrigerant capillary systems.
Determine reason and correct.
Correct charge.
11. Unit noisy.
Loose parts or mountings.
Tubing rattle.
Bent fan blade causing vibration.
Fan motor bearing worn.
Find and tighten.
Reform to be free of contact.
Replace blade.
Replace motor.
